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Nanoferromagnets in the focus of plasmon nanoantennas

Plasmonics is the field of science that studies light-matter interaction. Collective oscillations
of electrons at the surface of metals, resulting from an electromagnetic excitation,
are responsible for plasmonic phenomena. In metallic nanostructures, these oscillations
confine and enhance an electromagnetic field at a sub-wavelength scale, thus having a
huge impact on enhanced sensing and spectroscopy applications. Moreover, plasmonics
has been also used to enhance weak magneto-optical (MO) effects in magnetic materials.
Magneto-optical phenomena are interactions between a magnetic field in a medium and
an electromagnetic wave propagating through it [1], resulting in a rotation of the polarization
plane and a change in the ellipticity of the polarization state. Magneto-optically
active materials have nowadays found applications in a variety of contexts, such as magnetization
imaging [2], telecommunication [3], sensors and data storage [4].
Current research focuses on the development of materials with large MO activity to
improve the performance of these devices and expand their applications. Since an important
factor in integrated technology is size, scaling the dimensions of MO components
while preserving the readability of their signal is a crucial requirement. Since the MO
response of a material is related to the optical field inside it, plasmonics can allow for
its control and manipulation. The interplay between plasmons and magneto-optically
active elements has been an important research topic in the field of magnetoplasmonics
[5, 6]. Driven by such a research trend, fast, reliable and sensitive MO characterization
tools are required in magnetoplasmonics. Conventional systems like the MOKE optical
setup, based on frequency modulation methods, are expensive and rather time consuming
[7]. This is especially cumbersome in the investigation of small signals which require,
in addition, long detector integration time.
Here we develope a simple, fast, sensitive and broadband spectrometer-based plasmonic
and MO characterization tool. With this tool, which allows small MO signal detection
from nanostructures in ambient conditions [8], we study hybrid Au-Fe magnetoplasmonic
nanoantennas with different compositions. Evolution of the MO signal when changing
the relative amount of the two materials is assessed. We study the extinction spectra and
MO response of both the pure Au and hybrid Au-Fe magnetoplasmonic systems. The
trend studied is also compared to that of continuous Fe reference films. Our aim is to
assess whether these hybrid structures, combined with the use of our detection scheme,
are suitable to provide the reduction of the size of the magneto-optical active material
without losing the ability to read MO signal from these nanostructures.

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HarvardGhirardini, L. (2014) Nanoferromagnets in the focus of plasmon nanoantennas. Göteborg : Chalmers University of Technology

BibTeX @misc{Ghirardini2014,author={Ghirardini, Lavinia},title={Nanoferromagnets in the focus of plasmon nanoantennas},abstract={Plasmonics is the field of science that studies light-matter interaction. Collective oscillations
of electrons at the surface of metals, resulting from an electromagnetic excitation,
are responsible for plasmonic phenomena. In metallic nanostructures, these oscillations
confine and enhance an electromagnetic field at a sub-wavelength scale, thus having a
huge impact on enhanced sensing and spectroscopy applications. Moreover, plasmonics
has been also used to enhance weak magneto-optical (MO) effects in magnetic materials.
Magneto-optical phenomena are interactions between a magnetic field in a medium and
an electromagnetic wave propagating through it [1], resulting in a rotation of the polarization
plane and a change in the ellipticity of the polarization state. Magneto-optically
active materials have nowadays found applications in a variety of contexts, such as magnetization
imaging [2], telecommunication [3], sensors and data storage [4].
Current research focuses on the development of materials with large MO activity to
improve the performance of these devices and expand their applications. Since an important
factor in integrated technology is size, scaling the dimensions of MO components
while preserving the readability of their signal is a crucial requirement. Since the MO
response of a material is related to the optical field inside it, plasmonics can allow for
its control and manipulation. The interplay between plasmons and magneto-optically
active elements has been an important research topic in the field of magnetoplasmonics
[5, 6]. Driven by such a research trend, fast, reliable and sensitive MO characterization
tools are required in magnetoplasmonics. Conventional systems like the MOKE optical
setup, based on frequency modulation methods, are expensive and rather time consuming
[7]. This is especially cumbersome in the investigation of small signals which require,
in addition, long detector integration time.
Here we develope a simple, fast, sensitive and broadband spectrometer-based plasmonic
and MO characterization tool. With this tool, which allows small MO signal detection
from nanostructures in ambient conditions [8], we study hybrid Au-Fe magnetoplasmonic
nanoantennas with different compositions. Evolution of the MO signal when changing
the relative amount of the two materials is assessed. We study the extinction spectra and
MO response of both the pure Au and hybrid Au-Fe magnetoplasmonic systems. The
trend studied is also compared to that of continuous Fe reference films. Our aim is to
assess whether these hybrid structures, combined with the use of our detection scheme,
are suitable to provide the reduction of the size of the magneto-optical active material
without losing the ability to read MO signal from these nanostructures.},publisher={Institutionen för teknisk fysik, Chalmers tekniska högskola,},place={Göteborg},year={2014},keywords={magnetoplasmonics, nanoantenna, nanoferromagnet, Faraday rotation},note={44},}

RefWorks RT GenericSR ElectronicID 209388A1 Ghirardini, LaviniaT1 Nanoferromagnets in the focus of plasmon nanoantennasYR 2014AB Plasmonics is the field of science that studies light-matter interaction. Collective oscillations
of electrons at the surface of metals, resulting from an electromagnetic excitation,
are responsible for plasmonic phenomena. In metallic nanostructures, these oscillations
confine and enhance an electromagnetic field at a sub-wavelength scale, thus having a
huge impact on enhanced sensing and spectroscopy applications. Moreover, plasmonics
has been also used to enhance weak magneto-optical (MO) effects in magnetic materials.
Magneto-optical phenomena are interactions between a magnetic field in a medium and
an electromagnetic wave propagating through it [1], resulting in a rotation of the polarization
plane and a change in the ellipticity of the polarization state. Magneto-optically
active materials have nowadays found applications in a variety of contexts, such as magnetization
imaging [2], telecommunication [3], sensors and data storage [4].
Current research focuses on the development of materials with large MO activity to
improve the performance of these devices and expand their applications. Since an important
factor in integrated technology is size, scaling the dimensions of MO components
while preserving the readability of their signal is a crucial requirement. Since the MO
response of a material is related to the optical field inside it, plasmonics can allow for
its control and manipulation. The interplay between plasmons and magneto-optically
active elements has been an important research topic in the field of magnetoplasmonics
[5, 6]. Driven by such a research trend, fast, reliable and sensitive MO characterization
tools are required in magnetoplasmonics. Conventional systems like the MOKE optical
setup, based on frequency modulation methods, are expensive and rather time consuming
[7]. This is especially cumbersome in the investigation of small signals which require,
in addition, long detector integration time.
Here we develope a simple, fast, sensitive and broadband spectrometer-based plasmonic
and MO characterization tool. With this tool, which allows small MO signal detection
from nanostructures in ambient conditions [8], we study hybrid Au-Fe magnetoplasmonic
nanoantennas with different compositions. Evolution of the MO signal when changing
the relative amount of the two materials is assessed. We study the extinction spectra and
MO response of both the pure Au and hybrid Au-Fe magnetoplasmonic systems. The
trend studied is also compared to that of continuous Fe reference films. Our aim is to
assess whether these hybrid structures, combined with the use of our detection scheme,
are suitable to provide the reduction of the size of the magneto-optical active material
without losing the ability to read MO signal from these nanostructures.PB Institutionen för teknisk fysik, Chalmers tekniska högskola,LA engLK http://publications.lib.chalmers.se/records/fulltext/209388/209388.pdfOL 30